The name is absent

denote the waiting time until first entry into a two-year and four-year institutions,

respectively. In this case equation (1) above is replaced by

k^2y

S(k^2y,k⁴y∣z,θ²y β⁴y) = exp- θ^2y∑ exp(r_r^2y + (β^2y)‘z)

r=1

k^4y

-∑ expYy + (βr4y)‘z)]

r=1

where the parameters in (1N) have interpretations analogous to those described above.

Now, however, we have a quadruplet of location parameters (θ^2y, θ^4y, θ^g, θ^d) with
distribution function G( θ^2y,θ^4y, θ^g, θ^d). Again, we assume a mass point structure where
each of the N quadruplets occurs in the population with proportion p_n:

N
∑ pn = 1.
n=1

When focusing on those first entering four-year (two-year) institutions, those first
entering two-year (four-year) institutions will subsequently be censored in the likelihood
function.⁵

4. Data

⁵The likelihood function for the CR2 model can be derived in a manner similar to that for the DCR model
(see Appendix B). For the sake of brevity, however, we omit its derivation in this paper.

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